Feature request : option for StackFit

[Pielgrin]

Hello,

This plugin is really cool but I want to show a badge on a button in a row. The default StackFit parameter in Stack plugin forced to reduce button's size.
Is it possible to let user decide which StackFit he wants to use ?
In my case, the solution would be to change StackFit option to passthrough.

I can make a pull request to fix this if you want to.